There is an element reality in all this. I have been interested in UFO's for a long time, but not as a nut case, moreso from a scientific perspective. People ARE seeing things. I have seen some objects I could not explain. See my review at http://mufoncms.com/cgi-bin/manage_sighting_reports.pl?mode=view_long_desc&id=21763&rnd=499101268990902
My sighting was certainly not as dramatic as say Richard Willer and his wife's (see above), but as a pilot, and a person with alot of scientific background, how can you explain and incident like that, or thousands of others that people relate. These people are not making stuff up; you just cannot make up something with that much detail. So then you must ask, what did they see? And what about a mass sighting, like in Phoenix where hundreds of people saw something triangular with lights nearly a mile wide over the course of 1/2 an hour? Another thing that amazes me, is with EVERYONE having a camera in their phone now, that there is not more photographic evidence.
I am hesitant to speculate what people are seeing, but with so many reports and some with multiple witnesses, there is definitely something going on. If they are vehicles, this being an unperfect world, there will be a failure and there will be a crash from some reason, whether it is a midair, a shootdown, or just a mechanical. And with the information flow being so efficient and reports having a central reporting zone (see http://www.mufon.com ), there will be no hiding it, if it is terrestrially based (gov't, etc). But read through the reports at mufon, from common citizens who saw 'something'. You will find honest people who want answers. There are a few that are questionable, but mostly actual unexplainable phenomenon of some type(s) are being observed. And alot of it cannot be explained by current technology. A five foot black sphere with a vapor trail at altitude with a near midair? They did not make that up, so what the hell was that??? or all the others?.. I, and I am sure many others, would really like to know. And as pilots, we who have opportunities to observe UFO's, have an advantage in being able to describe and identify what we see, compared to the general public who don't know a jet from a recip.